Originally Posted by chris_barry

gauge is stuffed. Look around the garage as the ones in foot operated tyre pumps often have the similar thread. Borrow one from any appliance that reads the right range. Only use a generic pressure gauge for short term testing as they are not designed for gas and would probably explode and leak fuel everywhere if you left it installed long term.

With the return line disconnected it should read whatever the pressure regulator is set at. The reason for running with it disconnected is that if there is a blockage in the return line the fuel pressure would rise to the max that the pump can supply which is typically around the 70-90psi range.

Originally Posted by s2000Junky

Thanks